Daytime Aspect Camera for Balloon Altitudes

We have designed, built, and flight-tested a new star camera for daytime guiding of pointed balloon-borne experiments at altitudes around 40 km. The camera and lens are commercially available, off-the-shelf components, but require a custom-built baffle to reduce stray light, especially near the sunl...

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Bibliographic Details
Published in:Optical Engineering 2002-10, Vol.41 (10), p.2641-2651
Main Authors: Dietz, Kurt L., Ramsey, Brian D., Alexander, Cheryl D., Apple, Jeff A., Ghosh, Kajal K., Swift, Wesley R.
Format: Article
Language:English
Subjects:
atmospheric model
balloon
camera
guidance
Instrumentation And Photography
lens
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Summary:We have designed, built, and flight-tested a new star camera for daytime guiding of pointed balloon-borne experiments at altitudes around 40 km. The camera and lens are commercially available, off-the-shelf components, but require a custom-built baffle to reduce stray light, especially near the sunlit limb of the balloon. This new camera, which operates in the 600- to 1000-nm region of the spectrum, successfully provides daytime aspect information of approx. 10 arcsec resolution for two distinct star fields near the galactic plane. The detected scattered-light backgrounds show good agreement with the Air Force MODTRAN models used to design the camera, but the daytime stellar magnitude limit was lower than expected due to longitudinal chromatic aberration in the lens. Replacing the commercial lens with a custom-built lens should allow the system to track stars in any arbitrary area of the sky during the daytime.
ISSN:0091-3286
1560-2303
DOI:10.1117/1.1501566